// Copyright 2016 OpenConfigd Project.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package config

import (
	"io/ioutil"
	"strings"
	"syscall"
)

var (
	Hostname           string
	HostnameConfigured bool
)

func HostnameApi(set bool, Args []interface{}) {
	if len(Args) == 0 {
		return
	}
	hostname := Args[0].(string)
	if set {
		HostnameSet(hostname)
	} else {
		HostnameUnset()
	}
}

func HostnameSet(hostName string) {
	Hostname = hostName
	HostnameConfigured = true
	syscall.Sethostname([]byte(Hostname))
}

func HostnameUnset() {
	HostnameConfigured = false
	dat, _ := ioutil.ReadFile("/etc/hostname")
	str := strings.TrimSpace(string(dat))
	syscall.Sethostname([]byte(str))
}
